Keystones — Lintel
Five GCSE retrieval questions · 20 January 2023 · mathsvault.uk/keystones
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1. Number Converting to standard form
40000
Answer: 4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 58°. Find opposite
Answer: 25.6cm -
4. Ratio Mixed ratio problems
Simplify: 9:15:15
Answer: 3:5:5 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 18, 41, 15, 38, what is the missing number?
Answer: -7